mn 9 fact sheet
TRANSCRIPT
8/2/2019 Mn 9 Fact Sheet
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Assessment Point: MN-9
The following data are excerpts from multiple reports. While the same location in theMenomonee River watershed is represented, the assessment point IDs differ. Throughout
the following data, Assessment Point MN-9 is also represented by:
o Reach 848
o RI-21
o Menomonee River Downstream of Butler Ditch
o 127th
Street Extended
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C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
C i t y o f C i t y o f
C ED A R B UR G CE D A R B U R G
C it y of C i t y o f
ME Q UO N M EQ UO N
UPPER MENOMONEE RIVER
LI T TLE MENO M O N E E RIVER
LILLY CREEK
WILLO W C R E EK NOR-X-WAY CHANNEL
WEST BR ANCH MENOMO N E E RIV E R
NORTH BRANCH MENOMONEE RIVER
LITTLE MENOMONEE CREEK
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C i t y o f C i t y o f
M E Q U O N M E Q U O N
C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
UPPER MENOMONEE RIVER
LI T TLE MENO M O N E E RIVER
LILLY CREEK
WILLO W C R E EK NOR-X-WAY CHANNEL
WEST BR ANCH MENOMO N E E RIV E R
NORTH BRANCH MENOMONEE RIVER
LITTLE MENOMONEE CREEK
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C i t y o f C i t y o f
M E Q U O N M E Q U O N
C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
MN-11
MN-9
MN-2
MN-5
MN-4
MN-7
MN-3
MN-6
MN-1
MN-10
MN-12
MN-8 MN-9
MN-7
MN-6
MN-5
MN-4
MN-3 MN-2
MN-1
MN-11
MN-12
MN-10
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Constituent Measure Standard/Target
Geometric Mean Standard 200 counts/100 ml
Not to Exceed Standard 400 counts/100 ml
Dissolved Oxygen (DO) Minimum Concentration Standard 5 mg/l
Total Suspended Solids (TSS)
USGS Median TSS Reference Concentration (estimated
background concentration) 17.2 mg/l
Total Phosphorus (TP) Planning Guideline 0.1 mg/l
Flashiness
Richards Baker Flashiness Index (quantifies the frequencyand rapidity of short-term changes in stream flow; the index
ranges from 0 - 2, with 0 being constant flow) indicator only
Menomonee River Standards/Targets
Fecal Coliform
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Figure Overall Project
Team Assessment
Analysis
Chloride by flow(Cl not from
models)
Inconclusive (nowinter data)
It is difficult to assess chloride without data from the winter months; however, the data sugg
the chloride concentration.
Dissolved oxygen
by flow
Good Note the decline in dissolved oxygen concentration at low flows. This is likely due to a com
agitation and higher temperatures (low flow conditions are often associated with the warm su
Fecal coliform by
flow
Poor Generally, a pollutant that is present at high concentrations during high flows and low conce
(fecal coliform, in this case) is attributed primarily to non-point sources. The infrequent sew
years) would only contribute during the high flows when substantial non-point loads are alre
periods with the highest flows, fecal coliform counts exceed the regulatory standard more th
low flows, the standard is met more than 75% of the time. This would be the safest time for swimming, wading, etc.).
Phosphorus by
flow
Moderate to Poor Concentrations of phosphorus are greatest at high and low flows. This suggests a backgroun
noticeable during low flows (perhaps from non-contact cooling water) as well as non-point l
medium and high flows.
Suspended solids
by flow
Good The concentrations of suspended solids increase with increased flows, suggesting contributio
The suspended solids may come from runoff that carries a sediment load, from stream bank
stream sediments.
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Flashiness Index
Reach Description Richards Baker Flashiness Index
RI-21 127th
Street Ext. 0.42
Average Daily Flow
127th Street Ext. (848)
200
400
600
800
1000
1200
A V E R A
G E D A I L Y F L O W (
C F
S
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Existing Water Quality Data
AssessmentPoint
Water QualityIndicator
Statistic ConditionExisting
Mean (cells per 100 ml) 2,828Fecal Coliform Bacteria(annual)
Percent compliance with single samplestandard (<400 cells per 100 ml)
57
MN-9Menomonee River
Downstream of Butler Ditch
Geometric mean (cells per 100 ml) 489
Days of compliance with geometric meanstandard (<200 cells per 100 ml)
72
Mean (cells per 100 ml) 1,571Fecal Coliform Bacteria(May-September: 153days total) Percent compliance with single sample
standard (<400 cells per 100 ml)76
Geometric mean (cells per 100 ml) 229
Days of compliance with geometric meanstandard (<200 cells per 100 ml)
51
Dissolved Oxygen Mean (mg/l) 10.8
Median (mg/l) 11
Percent compliance with dissolved oxygenstandard (>5 mg/l)
99
Total Phosphorus Mean (mg/l) 0.101
Median (mg/l) 0.061
Percent compliance with recommendedphosphorus standard (0.1 mg/l)
69
Total Nitrogen Mean (mg/l) 1.08
Median (mg/l) 1
Total Suspended Solids Mean (mg/l) 15.7
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40
80
120
160
200
240
280
320
360
400
A v e r a g e N u
m b e r o f D a y s P e r Y e a r
Menomonee River @ 127th Street Ext (RI 21)
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Menomonee River @ 127th Street Ext (RI 21)
0
40
80
120
160
200
240
280
320
360
400
0 -4 0
4 0 0 -
6 0 0 -
1 0 0 0
2 0 0 0
3 0 0 0
4 0 0 0
5 0 0
A v e r a g e
N u m b e r o f D a y s P e r Y e a r
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Menomonee River @ 127th Street Ext (RI 21)
0
40
80
120
160
200
240
280
320
360
400
0 - 0 . 0 5
0 . 0 5 - 0 .
0 .1 - 0 .1
0 .1 5 - 0 .
0 .2 - 0 .2
0 .2 5 - 0 .
0 . 3 - 0 . 3
0 . 3 5 - 0 .
0 .4 - 0 .4
0 .4 5 - 0 .
A v e r a
g e N u m b e r o f D a y s P e r Y e
a r
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Menomonee River @ 127th Street Ext (RI 21)
0
40
80
120
160
200
240
280
320
360
400
A v e r a g e N u m b e r o f D a y s P e r Y e a r
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10
100
1000
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Acute Toxicity (757 mg/L) Chronic Toxicity (395 mg/L) Box & Whis
127th Street Ext. (RI-21) – Reach 848Chloride
Dry C on d iti ons
M id -ra nge F lo ws
Hig h F lo ws
Mo ist C on d iti ons
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10
100
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Regulatory Standard (5 mg/L) Box & Whiskers
127th Street Ext. (RI-21) – Reach 848Dissolved Oxygen
D ry C on d iti on s
M id - ra nge F lo ws
Hig h F lo ws
Mo ist C on d iti ons
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1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
C o n c e n t r a t i o n ( c f u / 1 0 0 m L )
Flow Conditions Regulatory Standard (400 cfu/100 mL) Box & Whiske
127th Street Ext. (RI-21) – Reach 848Fecal Coliform
D ry C on diti on s
Mid - ra n ge F lows
H ig h F lows
M o ist Con diti on s
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0.10
1.00
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Planning Standard (0.1 mg/L) Box & Whiskers
127th Street Ext. (RI-21) – Reach 848Total Phosphorus
D ry C on d iti on s
M id - ra nge F lo ws
Hig h F lo ws
Mo ist C on d iti ons
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10
100
1000
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Reference Concentration (17.2 mg/L) Box & Whiskers
127th Street Ext. (RI-21) – Reach 848Total Suspended Solids
D ry C on d iti on s
M id - ra nge F lo ws
Hig h F lo ws
Mo ist C on d iti ons